PLATE XXVII. 



LINCKIA s?., n. sp. (Page 100.) 



From the Lower Chalk. 



FIG. 



1. Actinal aspect; natural size. (Coll. Brit. Mus., B. 5055.) 

 a. Actinal aspect of portion of arm ; magnified 4 diameters. 



OPHIURA Frrcmr, n. sp., ex. Forbes, MS. (Page 103.) 

 From the Flint Gravel. 



2. Actinal aspect, natural size. (Coll. Norwich Mus.) 



a. Cast of actinal aspect in region of mouth ; magnified 4 diameters. 



b. Abactinal aspect ; natural size. 



OPHIUEA SEERATA, Boemer. (Page 102.) 

 From the Upper Chalk. 



3. Abactinal aspect; natural size. (Coll. Brit. Mus., E. 5043.) 



a. Abactinal aspect of segment of disc and two arms ; magnified 4 diameters. 

 I). Abactinal view of two isolated vertebral ossicles of another specimen ; mag- 

 nified 9 diameters. (Coll. Brit. Mus., E. 5046.) 



c. Side view of the same ossicles ; magnified 9 diameters. 



d. Anterior view of the same ossicles ; magnified 9 diameters. 



e. Posterior view of the same ossicles ; magnified 9 diameters. 



OPHIURA PARVISENTUM, n. sp. (Page 103.) 

 From the Upper Chalk. 



4. Abactinal aspect of type specimen; natural size. (Coll. Brit. Mus., E. 5052.) 

 a. Abactinal aspect of portion of one arm ; magnified 6 diameters. 



